Liberal filmmaker and author Michael Moore has written an open letter to Ivanka Trump in which he says her father is “in need of intervention.”

In the letter, published Wednesday on the leftist site AlterNet, Moore tells the daughter of Republican presidential nominee Donald Trump that “your dad is not well.”

He writes that Trump is in a “downward spiral” and that the candidate’s comments are becoming “more and more bizarre.” Moore cites Trump’s “call for gun owners to commit acts of violence against” Democratic nominee Hillary Clinton.

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Moore was referring to Trump’s comments at a rally Tuesday, when he said, “Hillary wants to abolish — essentially abolish the Second Amendment. By the way, if she gets to pick, if she gets to pick her judges, nothing you can do, folks. Although the Second Amendment people, maybe there is, I don’t know.”

The Republican nominee said after his speech that he was referring to the political power of the National Rifle Association. “This is a strong political movement, the Second Amendment,” Trump said Tuesday night on Fox News. “And there can be no other interpretation … I mean, give me a break.”

Moore, however, claims that Trump “has encouraged and given permission to the unhinged and the deranged to essentially assassinate Hillary Clinton. Her life is now in worse danger than it already was — and should anything happen, that will not only be on his head but also on those closest to him if they stand by and do nothing.”

The filmmaker says Ivanka Trump is the only person capable of conducting an intervention.

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“He trusts you. He believes in you. … I think he will listen to you,” Moore writes.

Saying she seems to be “a very smart and together woman,” he urges her to immediately speak with her father and pull him off the campaign trail.

Moore even had a suggestion as to how Ivanka Trump could approach the subject with her father. According to Moore, the scenario came from Jeff Gibbs, a former social worker and counselor as well as a friend of Moore’s.

In the imagined scenario, Ivanka would begin by asking if her father had a minute to chat.

She would then tell him she was concerned about him and his well-being.

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After pointing out Trump’s accomplishments, both in the business world and in his family, she would say:

Dad, I am deeply worried. You haven’t been yourself lately. The father I know is not a hater, not someone who encourages violence. Dad, you used to be A LIBERAL. You raised me as a liberal! The Clintons were your friends — Chelsea is one of my best friends! And now you’re joking that Hillary should be assassinated? Really?

Dad, I hate to say this, but you’re making me scared, you’re making my friends scared, and you’re scaring the whole country.